Not everything's copacetic. Runner-up Diego Fernandez de Cevallos of the center-right National Action Party (28 percent) and third-place Cuauhtemoc Cardenas of the Democratic Revolution Party (16 percent) said they suspected the official vote totals were off because of a shortage of absentee ballots and scattered irregularities. Cardenas, who lost the 1988 election to the P.R.I.'s Carlos Salinas de Gortari, drew at least 20,000 people to a central Mexico City square on Monday to protest an election he called "a colossal fraud." He plans another rally Saturday.